Merge remote-tracking branch 'Graphs_dart/bfs&dfs'

cmd/bin/graphs0.dart

@@ -51,10 +51,9 @@ void main(List<String> arguments) {
   List<Graphs> graphs = <Graphs>[];
   String name;
   String str = "";
-  Separators sep = Separators();
   while (deistvie != 0) {
     stdout.write(
-        "1 - создать граф, 2 - удалить граф, 3 - добавить в граф вершину,\n4 - удалить вершину, 5 - добавить ребро/дугу, 6 - удалить ребро/дугу,\n7 - вывести граф на экран, 8 - вывести граф в файл, 0 - выход\nDeistvie: ");
+        "1 - создать граф, 2 - удалить граф, 3 - добавить в граф вершину,\n4 - удалить вершину, 5 - добавить ребро/дугу, 6 - удалить ребро/дугу,\n7 - вывести граф на экран, 8 - вывести граф в файл, 9 - обход в ширину,\n0 - выход\nDeistvie: ");
     deistvie = getIntLine();
     switch (deistvie) {
       case 1:
@@ -112,9 +111,9 @@ void main(List<String> arguments) {
 
                   List<int> inn = <int>[];
                   List<int> len = <int>[];
-                  List<String> a = str.split(sep.space);
+                  List<String> a = str.split(Separators.space);
                   for (var splitted in a) {
-                    var dt = splitted.split(sep.dotToLength);
+                    var dt = splitted.split(Separators.dotToLength);
                     if (dt.length == 2) {
                       inn.add(int.parse(dt[0]));
                       len.add(int.parse(dt[1]));
@@ -157,13 +156,13 @@ void main(List<String> arguments) {
           stdout.write("Имя вершины: ");
           String dotName = getStrLine();
 
-          stdout.write(
+          /*stdout.write(
               "Ввод: *куда*|*вес* через пробел. Если граф не взвешенный, то *вес* можно не указывать.\nВершина cмежна с: ");
           str = getStrLine();
 
-          List<String> a = str.split(sep.space);
+          List<String> a = str.split(Separators.space);
           for (var splitted in a) {
-            var dt = splitted.split(sep.dotToLength);
+            var dt = splitted.split(Separators.dotToLength);
             if (dt.length == 2) {
               inn.add(int.parse(dt[0]));
               len.add(int.parse(dt[1]));
@@ -171,12 +170,12 @@ void main(List<String> arguments) {
               inn.add(int.parse(splitted));
               len.add(0);
             }
-          }
+          }*/
           printGraphsName(graphs);
           stdout.write("Вставка в графа с номером: ");
           int y = getIntLine();
           if (y >= 0 && y < graphs.length) {
-            graphs[y].addDotFromToLists(dotName, inn, len);
+            graphs[y].addIsolated(dotName);
           } else {
             print("Не найден граф с таким номером");
           }
@@ -244,7 +243,7 @@ void main(List<String> arguments) {
             num = graphs[y].getDotAmount();
             stdout.write(
                 "Количество вершин: $num. Введите через пробел 2 вершины, между которыми удалить ребро: ");
-            List<String> x = getStrLine().split(sep.space);
+            List<String> x = getStrLine().split(Separators.space);
             x1 = int.parse(x[0]);
             x2 = int.parse(x[1]);
             if (x1 >= 0 && x1 < num && x2 >= 0 && x2 < num) {
@@ -286,6 +285,29 @@ void main(List<String> arguments) {
           }
           break;
         }
+      case 9:
+        {
+          int num = graphs.length;
+          printGraphsName(graphs);
+          stdout.write("Работаем в графе с номером: ");
+          int y = getIntLine();
+          if (y >= 0 && y < num) {
+            graphs[y].printG();
+            num = graphs[y].getDotAmount();
+            stdout.write("Вершина, из которой выходят: ");
+            int x1 = getIntLine();
+            stdout.write("Вершина, в которую идут: ");
+            int x2 = getIntLine();
+            if (x1 >= 0 && x1 <= num && x2 >= 0 && x2 <= num) {
+              print("BFS: ${graphs[y].bfsPath(x1, x2)}");
+            } else {
+              print("Не найдены введеные вершины в графе\n");
+            }
+          } else {
+            print("Не найден граф с таким номером");
+          }
+          break;
+        }
       case 0:
         getStrLine();
         exit(0);

cmd/bin/src/graph.dart

@@ -1,15 +1,15 @@
 import 'dart:io';
 
 class Separators {
-  final String dotToConnections = ": ";
-  final String dotToLength = "|";
-  final String space = " ";
-  final String hasLength = "Взвешенный\n";
-  final String hasNoLength = "НеВзвешенный\n";
-  final String isOriented = "Ориентированный\n";
-  final String isNotOriented = "НеОриентированный\n";
-  final String nL = "\n";
-  final String end = "END";
+  static const String dotToConnections = ": ";
+  static const String dotToLength = "|";
+  static const String space = " ";
+  static const String hasLength = "Взвешенный";
+  static const String hasNoLength = "НеВзвешенный";
+  static const String isOriented = "Ориентированный";
+  static const String isNotOriented = "НеОриентированный";
+  static const String nL = "\n";
+  static const String end = "END";
 
   Separators();
 }
@@ -25,6 +25,7 @@ class Dot {
   String getName() => _name;
   bool hasConnection(int n) => _ln.containsKey(n);
   Map<int, int> getL() => _ln;
+
   int getLength(int x) {
     if (hasConnection(x)) {
       return _ln[x]!;
@@ -53,9 +54,9 @@ class Dot {
   }
 
   //******Constructor******
-  Dot() {
-    _name = "Undefined";
-    num = -1;
+  Dot([String name = "Undefined", int n = -1]) {
+    _name = name;
+    num = n;
     _ln = <int, int>{};
   }
   Dot.fromTwoLists(String name, List<int> num0, List<int> length,
@@ -97,11 +98,9 @@ class Graphs {
   bool _oriented = false; //Ориентированность
 
   //*********************Add************************
-  bool addDot(Dot a) {
+  String? addDot(Dot a) {
     if (getNumByName(a.getName()) != null) {
-      print(
-          "Dot name ${a.getName()} already in use. Change name or use addPath");
-      return false;
+      return ("Dot name \"${a.getName()}\" already in use. Change name or use addPath");
     }
     _amount++;
     a.num = _amount;
@@ -109,7 +108,7 @@ class Graphs {
     _syncNameTable();
     checkDots(false);
     if (!_oriented) _fullFix();
-    return true;
+    return null;
   }
 
   bool addDotFromToLists(String name, List<int> num0, List<int> length,
@@ -129,37 +128,40 @@ class Graphs {
     return true;
   }
 
-  bool addIsolated(String name) {
-    var o = addDot(Dot.fromTwoLists(name, [], []));
+  String? addIsolated(String name) {
+    var res = addDot(Dot.fromTwoLists(name, [], []));
     _syncNameTable();
-    return o;
+    return res;
   }
 
-  bool addPath(int from, int to, [int len = 0]) {
+  String? addPath(int from, int to, [int len = 0]) {
     if (from <= 0 || from > _amount || to <= 0 && to > _amount) {
-      return false;
+      return "Index out of range. Have dots 1..$_amount";
     }
     _dots[from - 1].addPath(to, len);
     if (!_oriented) {
       _dots[to - 1].addPath(from, len);
     }
-    return true;
+    return null;
   }
   //*********************Add************************
 
   //*********Delete*********
-  bool delPath(int from, int to) {
+  String? delPath(int from, int to) {
     if (from <= 0 || from > _amount || to <= 0 && to > _amount) {
-      return false;
+      return "Can't find specified path";
     }
     _dots[from - 1].delPath(to);
     if (!_oriented) {
       _dots[to - 1].delPath(from);
     }
-    return true;
+    return null;
   }
 
-  bool delDot(int inn) {
+  String? delDot(int inn) {
+    if (inn > _amount || inn < 1) {
+      return "Index out of range. Allowed 1..$_amount";
+    }
     List<int> toDel = <int>[];
     for (int i in _dots[inn - 1].getL().keys) {
       toDel.add(i);
@@ -171,7 +173,13 @@ class Graphs {
     _syncNum();
     _syncNameTable();
     _fixAfterDel(inn);
-    return true;
+    return null;
+  }
+
+  void flushData() {
+    _dots = <Dot>[];
+    _amount = 0;
+    _nameTable = <int, String>{};
   }
   //*********Delete*********
 
@@ -241,12 +249,121 @@ class Graphs {
   }
   //******Helper*******
 
+  //*****Setters*******
+  void setName(String name) => _name = name;
+  String? flipUseOrientation() {
+    if (_amount != 0) {
+      return "Can change use of orientation only in empty graph";
+    }
+    _oriented = !_oriented;
+    return null;
+  }
+
+  String? flipUseLength() {
+    if (_amount != 0) {
+      return "Can change use of length only in empty graph";
+    }
+    _useLength = !_useLength;
+    return null;
+  }
+
+  String? replaceDataFromFile(String path) {
+    File file = File(path);
+    List<String> lines = file.readAsLinesSync();
+    if (lines.length < 3) {
+      return "Not enough lines in file";
+    }
+    String name = lines.removeAt(0);
+    bool oriented;
+    switch (lines.removeAt(0)) {
+      case Separators.isOriented:
+        oriented = true;
+        break;
+      case Separators.isNotOriented:
+        oriented = false;
+        break;
+      default:
+        return "Error on parsing \"IsOriented\"";
+    }
+    bool useLength;
+    switch (lines.removeAt(0).trim()) {
+      case Separators.hasLength:
+        useLength = true;
+        break;
+      case Separators.hasNoLength:
+        useLength = false;
+        break;
+      default:
+        return "Error on parsing \"HasLength\"";
+    }
+    List<Dot> dots = <Dot>[];
+    for (var l in lines) {
+      l = l.trimRight();
+      if (l != Separators.end) {
+        var spl = l.split(Separators.space);
+        List<int> dot = <int>[];
+        List<int> len = <int>[];
+        String name = spl.removeAt(0);
+        name = name.substring(0, name.length - 1);
+        for (var splitted in spl) {
+          if (splitted != "") {
+            var dt = splitted.split(Separators.dotToLength);
+            if (dt.length == 2) {
+              int? parsed = int.tryParse(dt[0]);
+              if (parsed == null) {
+                return "Error while parsing file\nin parsing int in \"${dt[0]}\"";
+              }
+              dot.add(parsed);
+              if (useLength) {
+                parsed = int.tryParse(dt[1]);
+                if (parsed == null) {
+                  return "Error while parsing file\nin parsing int in \"${dt[1]}\"";
+                }
+                len.add(parsed);
+              } else {
+                len.add(0);
+              }
+            } else if (dt.length == 1) {
+              int? parsed = int.tryParse(splitted);
+              if (parsed == null) {
+                return "Error while parsing file\nin parsing int in \"$splitted\"";
+              }
+              dot.add(parsed);
+              len.add(0);
+            }
+          }
+        }
+        dots.add(Dot.fromTwoLists(name, dot, len));
+      }
+    }
+    _name = name;
+    _oriented = oriented;
+    _useLength = useLength;
+    _dots = dots;
+    _syncNum();
+    _syncNameTable();
+    if (!_oriented) _fullFix();
+    return null;
+  }
+  //*****Setters*******
+
   //*****Getters*******
-  bool getDoubleSided() => _oriented;
-  bool getUseLength() => _useLength;
+  bool getDoubleSidedBool() => _oriented;
+  String getDoubleSidedStr() {
+    if (_oriented) return Separators.isOriented;
+    return Separators.isNotOriented;
+  }
+
+  bool getUseLengthBool() => _useLength;
+  String getUseLengthStr() {
+    if (_useLength) return Separators.hasLength;
+    return Separators.hasNoLength;
+  }
+
   List<Dot> getDots() => _dots;
   String getName() => _name;
   String? getNameByNum(int n) => _nameTable[n];
+  Map<int, String> getNameTable() => _nameTable;
   int getDotAmount() => _dots.length;
   int? getNumByName(String n) {
     for (var i in _nameTable.keys) {
@@ -282,6 +399,23 @@ class Graphs {
     }
     return out;
   }
+
+  /*List<Dot> getNoRepeatDots() {
+    List<Dot> ret = <Dot>[];
+    for (int i = 0; i < _amount; i++) {
+      ret.add(Dot(_dots[i].getName(), _dots[i].num));
+    }
+    for (int i = 0; i < _amount; i++) {
+      for (int j in _dots[i].getL().keys) {
+        if (!ret[j - 1].hasConnection(i + 1) && !ret[i].hasConnection(j) ||
+            i == j) {
+          var len = _dots[i].getLength(j);
+          ret[i].addPath(j, len);
+        }
+      }
+    }
+    return ret;
+  }*/
   //*****Getters*******
 
   //******Print******
@@ -303,31 +437,34 @@ class Graphs {
   }
 
   void printToFile(String name) {
-    Separators sep = Separators();
     var file = File(name);
     file.writeAsStringSync("$_name\n");
     if (_oriented) {
-      file.writeAsStringSync(sep.isOriented, mode: FileMode.append);
+      file.writeAsStringSync("${Separators.isOriented}\n",
+          mode: FileMode.append);
     } else {
-      file.writeAsStringSync(sep.isNotOriented, mode: FileMode.append);
+      file.writeAsStringSync("${Separators.isNotOriented}\n",
+          mode: FileMode.append);
     }
     if (_useLength) {
-      file.writeAsStringSync(sep.hasLength, mode: FileMode.append);
+      file.writeAsStringSync("${Separators.hasLength}\n",
+          mode: FileMode.append);
     } else {
-      file.writeAsStringSync(sep.hasNoLength, mode: FileMode.append);
+      file.writeAsStringSync("${Separators.hasNoLength}\n",
+          mode: FileMode.append);
     }
     for (int i = 0; i < _amount; i++) {
-      file.writeAsStringSync((i + 1).toString() + sep.dotToConnections,
+      file.writeAsStringSync((i + 1).toString() + Separators.dotToConnections,
           mode: FileMode.append);
       var d = _dots[i].getL();
       for (var j in d.keys) {
         file.writeAsStringSync(
-            j.toString() + sep.dotToLength + d[j].toString() + " ",
+            j.toString() + Separators.dotToLength + d[j].toString() + " ",
             mode: FileMode.append);
       }
-      file.writeAsStringSync(sep.nL, mode: FileMode.append);
+      file.writeAsStringSync(Separators.nL, mode: FileMode.append);
     }
-    file.writeAsStringSync(sep.end, mode: FileMode.append);
+    file.writeAsStringSync(Separators.end, mode: FileMode.append);
   }
   //******Print******
 
@@ -353,22 +490,22 @@ class Graphs {
     if (!_oriented) _fullFix();
   }
   Graphs.fromFile(String path) {
-    Separators sep = Separators();
-    File file = File(path);
+    replaceDataFromFile(path);
+    /*File file = File(path);
     List<String> lines = file.readAsLinesSync();
     _name = lines.removeAt(0);
-    _oriented = lines.removeAt(0) == sep.isOriented.trim();
-    _useLength = lines.removeAt(0) == sep.hasLength.trim();
+    _oriented = lines.removeAt(0) == Separators.isOriented.trim();
+    _useLength = lines.removeAt(0) == Separators.hasLength.trim();
     _dots = <Dot>[];
     for (var l in lines) {
-      if (l != sep.end) {
-        var spl = l.split(sep.space);
+      if (l != Separators.end) {
+        var spl = l.split(Separators.space);
         List<int> dot = <int>[];
         List<int> len = <int>[];
         String name = spl.removeAt(0);
         name = name.substring(0, name.length - 1);
         for (var splitted in spl) {
-          var dt = splitted.split(sep.dotToLength);
+          var dt = splitted.split(Separators.dotToLength);
           if (dt.length == 2) {
             dot.add(int.parse(dt[0]));
             if (_useLength) {
@@ -386,7 +523,7 @@ class Graphs {
     }
     _syncNum();
     _syncNameTable();
-    if (!_oriented) _fullFix();
+    if (!_oriented) _fullFix();*/
   }
   //*******Constructor********
 
@@ -394,14 +531,14 @@ class Graphs {
   Graphs.clone(Graphs a) {
     _name = a.getName();
     _dots = a.getDots();
-    _oriented = a.getDoubleSided();
-    _useLength = a.getUseLength();
+    _oriented = a.getDoubleSidedBool();
+    _useLength = a.getUseLengthBool();
     _amount = _dots.length;
     _syncNameTable();
   }
 
   //************Алгоритмы************
-  bool bfsHasPath(int startDot, int goalDot) {
+  /* bool bfsHasPath(int startDot, int goalDot) {
     // обход в ширину
     startDot--;
     goalDot--;
@@ -428,9 +565,10 @@ class Graphs {
       }
     }
     return false; // Целевой узел недостижим
-  }
+  }*/
 
   List<int>? bfsPath(int startDot, int goalDot) {
+    if (startDot == goalDot) return [startDot];
     //if (!bfsHasPath(startDot, goalDot)) return null;
     startDot--;
     goalDot--;
@@ -470,7 +608,6 @@ class Graphs {
 
     //Восстановим кратчайший путь
     //Для восстановления пути пройдём его в обратном порядке, и развернём.
-
     List<int> path = <int>[];
 
     int cur = goalDot; //текущая вершина пути
@@ -493,21 +630,25 @@ class Graphs {
 
   List<bool>? dfsIterative(int v) {
     v--;
+    //List<int>? pos = <int>[];
     List<bool> label = <bool>[];
     for (int i = 0; i < _amount; i++) {
       label.add(false);
     }
     List<int> stack = <int>[];
     stack.add(v);
+    //pos.add(v);
     while (stack.isNotEmpty) {
       v = stack.removeLast();
       if (!label[v]) {
         label[v] = true;
         for (int i in _dots[v].getL().keys) {
           stack.add(i - 1);
+          //pos.add(i);
         }
       }
     }
+    //print(pos);
     return label;
   }
 

flutter/lib/curve_painter.dart

@@ -8,71 +8,85 @@ class CurvePainter extends CustomPainter {
     Key? key,
     required this.graphData,
     required this.bfsPath,
-    required this.dfsStart,
+    required this.start,
+    required this.end,
     required this.dfsAccessTable,
   });
 
   List<int>? bfsPath;
   List<bool>? dfsAccessTable;
-  int? dfsStart;
+  int? start;
+  int? end;
   Graphs graphData;
-  final double dotRad = 6;
-  final double lineWidth = 2;
-  final Color lineColor = Colors.black;
-  final double aboveHeight = 5;
-  double circleRad = 100;
-  final TextStyle textStyle = TextStyle(
-    color: Colors.green.shade900,
+  final double _dotRad = 6;
+  final double _lineWidth = 1.5;
+  final Color _lineColor = Colors.black;
+  final double _aboveHeight = 5;
+  double _circleRad = 100;
+  final TextStyle _textStyle = TextStyle(
+    color: Colors.red.shade900,
+    decorationColor: Colors.green.shade900,
+    decorationThickness: 10,
+    decorationStyle: TextDecorationStyle.dashed,
     fontSize: 20,
   );
-
-  void drawLine(Canvas canvas, Offset p1, Offset p2) {
+  Map<int, Offset> _off = <int, Offset>{};
+  void _drawLine(Canvas canvas, Offset p1, Offset p2) {
     Paint p = Paint();
-    p.color = lineColor;
-    p.strokeWidth = lineWidth;
+    p.color = _lineColor;
+    p.strokeWidth = _lineWidth;
     canvas.drawLine(p1, p2, p);
   }
 
-  void drawDot(Canvas canvas, Offset p1) {
+  void _drawDot(Canvas canvas, Offset p1, [double plusRad = 0, Color? col]) {
+    col ??= Colors.yellow.shade900;
     var p = Paint();
-    p.color = Colors.yellow.shade900;
-    p.strokeWidth = lineWidth + 2;
-    canvas.drawCircle(p1, dotRad, p);
+    p.color = col;
+    p.strokeWidth = _lineWidth + 2;
+    canvas.drawCircle(p1, _dotRad + plusRad, p);
   }
 
-  void drawSelfConnect(Canvas canvas, Offset p1) {
+  void _drawSelfConnect(Canvas canvas, Offset p1) {
     var p = Paint();
-    p.color = lineColor;
-    p.strokeWidth = lineWidth;
+    p.color = _lineColor;
+    p.strokeWidth = _lineWidth;
     p.style = PaintingStyle.stroke;
-    canvas.drawCircle(Offset(p1.dx + dotRad + 20, p1.dy), dotRad + 20, p);
+    canvas.drawCircle(Offset(p1.dx + _dotRad + 20, p1.dy), _dotRad + 20, p);
   }
 
-  TextSpan _getTextSpan(String s) => TextSpan(text: s, style: textStyle);
+  TextSpan _getTextSpan(String s) => TextSpan(text: s, style: _textStyle);
   TextPainter _getTextPainter(String s) => TextPainter(
       text: _getTextSpan(s),
       textDirection: TextDirection.ltr,
       textAlign: TextAlign.center);
 
-  void drawDotNames(Canvas canvas, Offset place, String s) {
+  void _drawDotNames(Canvas canvas, Offset place, String s) {
     var textPainter = _getTextPainter(s);
     textPainter.layout();
     textPainter.paint(
         canvas,
         Offset((place.dx - textPainter.width),
-            (place.dy - textPainter.height) - aboveHeight));
+            (place.dy - textPainter.height) - _aboveHeight));
   }
 
-  void drawAboveText(Canvas canvas, Offset size, String s) {
-    var textPainter = _getTextPainter(s);
+  void _drawDotNum(Canvas canvas, Offset size, String s) {
+    var textPainter = TextPainter(
+        text: TextSpan(
+            text: s,
+            style: const TextStyle(
+              color: Colors.black,
+              fontSize: 17,
+            )),
+        textDirection: TextDirection.ltr,
+        textAlign: TextAlign.center);
     textPainter.layout();
     textPainter.paint(
         canvas,
-        Offset((size.dx - textPainter.width),
-            (size.dy - textPainter.height) - aboveHeight));
+        Offset((size.dx - textPainter.width) + 25,
+            (size.dy - textPainter.height) + _aboveHeight + 30));
   }
 
-  int getHighInputConnections() {
+  int _getHighInputConnections() {
     if (graphData.getDots().length != 1 && graphData.getDots().length <= 3) {
       return -1;
     }
@@ -83,17 +97,18 @@ class CurvePainter extends CustomPainter {
     return higest;
   }
 
-  Map<int, Offset> getDotPos(int dotsAm, Size size, [int? exclude]) {
+  Map<int, Offset> _getDotPos(int dotsAm, Size size) {
     Map<int, Offset> off = <int, Offset>{};
     var width = size.width / 2;
     var height = size.height / 2;
     int add = 0;
-    int h = getHighInputConnections();
+    int h = _getHighInputConnections();
     for (int i = 0; i < dotsAm; i++) {
       if ((i + 1) != h) {
-        double x = cos(2 * pi * (i - add) / (dotsAm - add)) * circleRad + width;
+        double x =
+            cos(2 * pi * (i - add) / (dotsAm - add)) * _circleRad + width;
         double y =
-            sin(2 * pi * (i - add) / (dotsAm - add)) * circleRad + height;
+            sin(2 * pi * (i - add) / (dotsAm - add)) * _circleRad + height;
 
         off[i + 1] = Offset(x, y);
       } else if ((i + 1) == h) {
@@ -110,7 +125,7 @@ class CurvePainter extends CustomPainter {
     return off;
   }
 
-  void drawHArrow(Canvas canvas, Size size, Offset from, Offset to,
+  void _drawHArrow(Canvas canvas, Size size, Offset from, Offset to,
       [bool doubleSided = false]) {
     Path path;
 
@@ -120,7 +135,7 @@ class CurvePainter extends CustomPainter {
       ..style = PaintingStyle.stroke
       ..strokeCap = StrokeCap.round
       ..strokeJoin = StrokeJoin.round
-      ..strokeWidth = lineWidth;
+      ..strokeWidth = _lineWidth;
 
     var length = sqrt((to.dx - from.dx) * (to.dx - from.dx) +
         (to.dy - from.dy) * (to.dy - from.dy));
@@ -131,8 +146,8 @@ class CurvePainter extends CustomPainter {
     path.relativeCubicTo(
         0,
         0,
-        -(from.dx + to.dx) / (length * 2) - 40,
-        -(from.dy + to.dy) / (length * 2) - 40,
+        -(from.dx + to.dx + length) / (length) - 40,
+        -(from.dy + to.dy + length) / (length) - 40,
         to.dx - from.dx,
         to.dy - from.dy);
     path =
@@ -140,7 +155,7 @@ class CurvePainter extends CustomPainter {
     canvas.drawPath(path, paint);
   }
 
-  void drawHighArrow(Canvas canvas, Size size, Offset from, Offset to,
+  void _drawHighArrow(Canvas canvas, Size size, Offset from, Offset to,
       [bool doubleSided = false]) {
     Path path;
 
@@ -150,7 +165,7 @@ class CurvePainter extends CustomPainter {
       ..style = PaintingStyle.stroke
       ..strokeCap = StrokeCap.round
       ..strokeJoin = StrokeJoin.round
-      ..strokeWidth = lineWidth;
+      ..strokeWidth = _lineWidth;
 
     var length = sqrt((to.dx - from.dx) * (to.dx - from.dx) +
         (to.dy - from.dy) * (to.dy - from.dy));
@@ -161,7 +176,7 @@ class CurvePainter extends CustomPainter {
     path.relativeCubicTo(
         0,
         0,
-        (from.dx + to.dx) / (length * 3) + 40,
+        (from.dx + to.dx) / (length * 2) + 40,
         (from.dy + to.dy) / (length * 2) + 40,
         to.dx - from.dx,
         to.dy - from.dy);
@@ -173,29 +188,29 @@ class CurvePainter extends CustomPainter {
     canvas.drawPath(path, paint);
   }
 
-  void drawConnections(
+  void _drawConnections(
       Canvas canvas, Size size, List<Dot> dots, Map<int, Offset> off) {
     for (var i in dots) {
       var list = i.getL();
       var beg = off[i.num];
       for (var d in list.keys) {
         if (d == i.num) {
-          drawSelfConnect(canvas, off[d]!);
+          _drawSelfConnect(canvas, off[d]!);
         } else {
           if (graphData.getDoubleSidedBool()) {
             if (d > i.num) {
-              drawHArrow(canvas, size, beg!, off[d]!, false);
+              _drawHArrow(canvas, size, beg!, off[d]!, false);
               if (graphData.getUseLengthBool()) {
-                drawDotNames(
+                _drawDotNames(
                     canvas,
                     Offset((off[d]!.dx + beg.dx) / 2 - 18,
                         (off[d]!.dy + beg.dy) / 2 - 18),
                     i.getL()[d].toString());
               }
             } else {
-              drawHighArrow(canvas, size, beg!, off[d]!, false);
+              _drawHighArrow(canvas, size, beg!, off[d]!, false);
               if (graphData.getUseLengthBool()) {
-                drawDotNames(
+                _drawDotNames(
                     canvas,
                     Offset((off[d]!.dx + beg.dx) / 2 + 30,
                         (off[d]!.dy + beg.dy) / 2 + 30),
@@ -203,9 +218,9 @@ class CurvePainter extends CustomPainter {
               }
             }
           } else {
-            drawLine(canvas, beg!, off[d]!);
+            _drawLine(canvas, beg!, off[d]!);
             if (graphData.getUseLengthBool()) {
-              drawDotNames(
+              _drawDotNames(
                   canvas,
                   Offset((off[d]!.dx + beg.dx) / 2, (off[d]!.dy + beg.dy) / 2),
                   i.getL()[d].toString());
@@ -216,184 +231,67 @@ class CurvePainter extends CustomPainter {
     }
   }
 
+  void _drawBFS(Canvas canvas) {
+    if (bfsPath != null) {
+      for (int i = 0; i < bfsPath!.length; i++) {
+        _drawDot(canvas, _off[bfsPath![i]]!, 8, Colors.yellow);
+      }
+      _drawDot(canvas, _off[start]!, 9, Colors.green);
+      _drawDot(canvas, _off[end]!, 7, Colors.red.shade200);
+      for (int i = 0; i < bfsPath!.length; i++) {
+        _drawDotNum(canvas, _off[bfsPath![i]]!, "bfs: №${i + 1}");
+      }
+    }
+  }
+
+  void _drawDFS(Canvas canvas) {
+    if (dfsAccessTable != null) {
+      print("nn");
+      for (int i = 0; i < dfsAccessTable!.length; i++) {
+        if (dfsAccessTable![i]) {
+          _drawDot(canvas, _off[i + 1]!, 8, Colors.green.shade500);
+          _drawDotNum(canvas, _off[i + 1]!, "dfs: visible");
+        } else {
+          _drawDot(canvas, _off[i + 1]!, 7, Colors.red.shade500);
+          _drawDotNum(canvas, _off[i + 1]!, "dfs: not visible");
+        }
+      }
+      _drawDot(canvas, _off[start]!, 9, Colors.green.shade900);
+    }
+  }
+
   @override
   void paint(Canvas canvas, Size size) {
     if (size.width > size.height) {
-      circleRad = size.height / 3;
+      _circleRad = size.height / 3;
     } else {
-      circleRad = size.width / 3;
+      _circleRad = size.width / 3;
     }
-    //var paint = Paint();
-    //drawLine(canvas, Offset(0, size.height / 2),
-    //Offset(size.width, size.height / 2));
 
-    //gr = getGraph();
-    //int higest = getHighConnections();
-    //if (higest > -1) {
-    var off = getDotPos(graphData.getDotAmount(), size); //, higest);
-    //off[higest] = Offset(size.width / 2, size.height / 2);
-    for (int i in off.keys) {
-      drawDot(canvas, off[i]!);
-      drawDotNames(
-          canvas, off[i]!, "${graphData.getDots()[i - 1].getName()}:[$i]");
+    _off = _getDotPos(graphData.getDotAmount(), size); //, higest);
+    for (int i in _off.keys) {
+      _drawDot(canvas, _off[i]!);
+      //drawDotNames(canvas, off[i]!, "${graphData.getDots()[i - 1].getName()}:[$i]");
     }
-    //var g = gr.getNoRepeatDots();
-    //print(g);
+
     var g = graphData.getDots();
-    drawConnections(canvas, size, g, off);
+    _drawBFS(canvas);
+    _drawDFS(canvas);
+    _drawConnections(canvas, size, g, _off);
     //pringArr(canvas, size);
     //drawArrow(canvas, Offset(size.width / 2, size.height / 2),
     //   Offset(size.width / 2 + 50, size.height / 2 + 200));
     //}
+
+    for (int i in _off.keys) {
+      //drawDot(canvas, off[i]!);
+      _drawDotNames(
+          canvas, _off[i]!, "${graphData.getDots()[i - 1].getName()}:[$i]");
+    }
   }
 
   @override
   bool shouldRepaint(CustomPainter oldDelegate) {
     return true;
   }
-
-  /*void _drawTextAt(String txt, Offset position, Canvas canvas) {
-    final textPainter = getTextPainter(txt);
-    textPainter.layout(minWidth: 0, maxWidth: 0);
-    Offset drawPosition =
-        Offset(position.dx, position.dy - (textPainter.height / 2));
-    textPainter.paint(canvas, drawPosition);
-  }*/
-}
-
-void pringArr(Canvas canvas, Size size) {
-  TextSpan textSpan;
-  TextPainter textPainter;
-  Path path;
-
-  // The arrows usually looks better with rounded caps.
-  Paint paint = Paint()
-    ..color = Colors.black
-    ..style = PaintingStyle.stroke
-    ..strokeCap = StrokeCap.round
-    ..strokeJoin = StrokeJoin.round
-    ..strokeWidth = 3.0;
-
-  /// Draw a single arrow.
-  path = Path();
-  path.moveTo(size.width * 0.25, size.height * 0.10);
-  path.relativeCubicTo(0, 0, size.width * 0.25, 50, size.width * 0.5, 0);
-  path = ArrowPath.make(path: path);
-  canvas.drawPath(path, paint..color = Colors.blue);
-
-  textSpan = const TextSpan(
-    text: 'Single arrow',
-    style: TextStyle(color: Colors.blue),
-  );
-  textPainter = TextPainter(
-    text: textSpan,
-    textAlign: TextAlign.center,
-    textDirection: TextDirection.ltr,
-  );
-  textPainter.layout(minWidth: size.width);
-  textPainter.paint(canvas, Offset(0, size.height * 0.06));
-/*
-  /// Draw a double sided arrow.
-  path = Path();
-  path.moveTo(size.width * 0.25, size.height * 0.2);
-  path.relativeCubicTo(0, 0, size.width * 0.25, 50, size.width * 0.5, 0);
-  path = ArrowPath.make(path: path, isDoubleSided: true);
-  canvas.drawPath(path, paint..color = Colors.cyan);
-
-  textSpan = const TextSpan(
-    text: 'Double sided arrow',
-    style: TextStyle(color: Colors.cyan),
-  );
-  textPainter = TextPainter(
-    text: textSpan,
-    textAlign: TextAlign.center,
-    textDirection: TextDirection.ltr,
-  );
-  textPainter.layout(minWidth: size.width);
-  textPainter.paint(canvas, Offset(0, size.height * 0.16));
-
-  /// Use complex path.
-  path = Path();
-  path.moveTo(size.width * 0.25, size.height * 0.3);
-  path.relativeCubicTo(0, 0, size.width * 0.25, 0, size.width * 0.5, 50);
-  path.relativeCubicTo(0, 0, -size.width * 0.25, 50, -size.width * 0.5, 50);
-  //path.relativeCubicTo(0, 0, size.width * 0.125, 10, size.width * 0.25, -10);
-  path = ArrowPath.make(path: path, isDoubleSided: true);
-  canvas.drawPath(path, paint..color = Colors.blue);
-
-  textSpan = const TextSpan(
-    text: 'Complex path',
-    style: TextStyle(color: Colors.blue),
-  );
-  textPainter = TextPainter(
-    text: textSpan,
-    textAlign: TextAlign.center,
-    textDirection: TextDirection.ltr,
-  );
-  textPainter.layout(minWidth: size.width);
-  textPainter.paint(canvas, Offset(0, size.height * 0.28));
-
-  /// Draw several arrows on the same path.
-  path = Path();
-  path.moveTo(size.width * 0.25, size.height * 0.53);
-  path.relativeCubicTo(0, 0, size.width * 0.25, 50, size.width * 0.5, 50);
-  path = ArrowPath.make(path: path);
-  path.relativeCubicTo(0, 0, -size.width * 0.25, 0, -size.width * 0.5, 50);
-  path = ArrowPath.make(path: path);
-  Path subPath = Path();
-  subPath.moveTo(size.width * 0.375, size.height * 0.53 + 100);
-  subPath.relativeCubicTo(0, 0, size.width * 0.125, 10, size.width * 0.25, -10);
-  subPath = ArrowPath.make(path: subPath, isDoubleSided: true);
-  path.addPath(subPath, Offset.zero);
-  canvas.drawPath(path, paint..color = Colors.cyan);
-
-  textSpan = const TextSpan(
-    text: 'Several arrows on the same path',
-    style: TextStyle(color: Colors.cyan),
-  );
-  textPainter = TextPainter(
-    text: textSpan,
-    textAlign: TextAlign.center,
-    textDirection: TextDirection.ltr,
-  );
-  textPainter.layout(minWidth: size.width);
-  textPainter.paint(canvas, Offset(0, size.height * 0.49));
-
-  /// Adjusted
-  path = Path();
-  path.moveTo(size.width * 0.1, size.height * 0.8);
-  path.relativeCubicTo(0, 0, size.width * 0.3, 50, size.width * 0.25, 75);
-  path = ArrowPath.make(path: path, isAdjusted: true);
-  canvas.drawPath(path, paint..color = Colors.blue);
-
-  textSpan = const TextSpan(
-    text: 'Adjusted',
-    style: TextStyle(color: Colors.blue),
-  );
-  textPainter = TextPainter(
-    text: textSpan,
-    textAlign: TextAlign.left,
-    textDirection: TextDirection.ltr,
-  );
-  textPainter.layout();
-  textPainter.paint(canvas, Offset(size.width * 0.2, size.height * 0.77));
-
-  /// Non adjusted.
-  path = Path();
-  path.moveTo(size.width * 0.6, size.height * 0.8);
-  path.relativeCubicTo(0, 0, size.width * 0.3, 50, size.width * 0.25, 75);
-  path = ArrowPath.make(path: path, isAdjusted: false);
-  canvas.drawPath(path, paint..color = Colors.blue);
-
-  textSpan = const TextSpan(
-    text: 'Non adjusted',
-    style: TextStyle(color: Colors.blue),
-  );
-  textPainter = TextPainter(
-    text: textSpan,
-    textAlign: TextAlign.left,
-    textDirection: TextDirection.ltr,
-  );
-  textPainter.layout();
-  textPainter.paint(canvas, Offset(size.width * 0.65, size.height * 0.77));*/
 }

flutter/lib/pages/drawing_page.dart

@@ -26,7 +26,10 @@ class _DrawingPageState extends State<DrawingPage> {
   Graphs graphData = getGraph();
   List<int>? bfsPath;
   List<bool>? dfsAccessTable;
-  int? dfsStartDot;
+  int? startDot;
+  int? endDot;
+  String? dropdownValue1;
+  String? dropdownValue2;
 
   final _textNameController = TextEditingController();
   final _textNumbController = TextEditingController();
@@ -34,118 +37,23 @@ class _DrawingPageState extends State<DrawingPage> {
   final _textLnthController = TextEditingController();
   final _textGrNmController = TextEditingController();
 
-  void clearTextControllers() {
-    _textDestController.clear();
-    _textNumbController.clear();
-    _textLnthController.clear();
-    _textNameController.clear();
+  void clearInputData() {
+    setState(() {
+      _textDestController.clear();
+      _textNumbController.clear();
+      _textLnthController.clear();
+      _textNameController.clear();
+      dropdownValue1 = null;
+      dropdownValue2 = null;
+      /*startDot = null;
+      bfsPath = null;
+      dfsAccessTable = null;
+      endDot = null;*/
+    });
   }
 
-  @override
-  Widget build(BuildContext context) {
-    screenSize = MediaQuery.of(context).size.width;
-    _textGrNmController.text = graphData.getName();
-    return MaterialApp(
-        home: Scaffold(
-      appBar: AppBar(
-          title: const Align(
-              alignment: Alignment.topLeft,
-              child: Text("Graph name:\n",
-                  style: TextStyle(
-                    fontSize: 18,
-                    color: Colors.white,
-                  ))),
-          toolbarHeight: 110,
-          flexibleSpace: Container(
-            color: Colors.green.shade900,
-            child: Column(children: <Widget>[
-              const SizedBox(height: 5),
-              Row(children: [
-                addSpaceW(screenSize / 8 + 19),
-                createButton("\nAdd dot\n", addDotPushed),
-                createInputBox("Dot name", screenSize / 4 - 25, Icons.label,
-                    _textNameController),
-                addSpaceW(8),
-                createButton("\nAdd path\n", addPathPushed),
-                createInputBox("Input length", screenSize / 4 - 25,
-                    Icons.arrow_right_alt_outlined, _textLnthController),
-              ]),
-              addSpaceH(3),
-              Row(children: [
-                addSpaceW(5),
-                createInputBox(
-                    "Name", screenSize / 8 - 25, null, _textGrNmController),
-                //addSpaceW(screenSize / 8 - 4),
-                createButton("\nDel dot \n", delDotPushed),
-                createInputBox("Dot number", screenSize / 4 - 25,
-                    Icons.fiber_manual_record, _textNumbController),
-                addSpaceW(13),
-                createButton("\nDel path\n", delPathPushed),
-                createInputBox("Destination number", screenSize / 4 - 25,
-                    Icons.fiber_manual_record, _textDestController),
-              ]),
-            ]),
-          ),
-          actions: [
-            IconButton(
-              onPressed: () => graphData.flushData(),
-              icon: const Icon(Icons.delete_sweep),
-              iconSize: 60,
-            ),
-          ]),
-      body: CustomPaint(
-        painter: CurvePainter(
-            graphData: graphData,
-            bfsPath: bfsPath,
-            dfsStart: dfsStartDot,
-            dfsAccessTable: dfsAccessTable),
-        child: Align(
-          alignment: Alignment.topRight,
-          child: ButtonBar(
-            mainAxisSize: MainAxisSize.min,
-            children: <Widget>[
-              createButton("Bfs", bfsPushed),
-              createButton("Dfs", dfsPushed),
-              createButton("Clear dfs or bfs", () => bfsPath = null),
-              createButton(graphData.getUseLengthStr(), changeLength),
-              createButton(graphData.getDoubleSidedStr(), changeOriented),
-              /*Text(_textGrNmController.text,
-                  style:
-                      TextStyle(fontSize: 15, color: Colors.blueGrey.shade900)),*/
-              createButton("Save to file", fileSaver),
-              createButton("Load from file", fileOpener),
-              createButton("Help", () {
-                String out =
-                    "   В поле \"Graph name\" можно сменить имя графу.\n";
-                out +=
-                    "   Для добавления точки необходимо ввести имя в \"Dot name\" и нажать на \"Add dot\".\n";
-                out +=
-                    "   Для удаления точки необходимо ввести номер в \"Dot number\" и нажать на \"Del dot\".\n";
-                out +=
-                    "   Для добавления пути необходимо ввести: номер выходной вершины в \"Dot number\", номер входной вершины в \"Destination number\" ";
-                out +=
-                    "и, если граф взвешенный, то ввести длину пути в \"Input length\". Затем нажать \"Add path\".\n";
-                out +=
-                    "   Для удаления пути необходимо ввести номер выходной вершины в \"Dot number\" и номер входной вершины в \"Destination number\". Затем нажать \"Del path\".\n\n";
-                out +=
-                    "   Кнопки \"Bfs\" и \"Dfs\" нумеруют точки в зависимости от послежовательности, в которой они будут пройдены.\n";
-                out +=
-                    "   Кнопки \"Взвешенный\" и \"Ориентированный\" позволяют сменить эти значения перед построением графа (т.е. для их работы граф должен быть пустым).\n";
-                out +=
-                    "   Кнопки \"Save to file\" и \"Load from file\" позволяют вывести информацию в файл и загрузить информацию из файла соответственно.\n";
-                out +=
-                    "   Кнопка \"Help\" описывает работу с интерфейсом программы.";
-                showPopUp("Help:", out);
-              })
-            ],
-          ),
-        ),
-      ),
-    ));
-  }
-
-  // ignore: avoid_types_as_parameter_names, non_constant_identifier_names, use_function_type_syntax_for_parameters
-  ElevatedButton createButton(String txt, void onPressing()) {
+  // *************buttons*************
+  ElevatedButton createButton(String txt, void Function() onPressing) {
     return ElevatedButton(
       onPressed: onPressing,
       style: ButtonStyle(
@@ -160,6 +68,32 @@ class _DrawingPageState extends State<DrawingPage> {
     );
   }
 
+  void showPopUp(String alertTitle, String err) => showDialog<String>(
+        context: context,
+        builder: (BuildContext context) => AlertDialog(
+          title: Text(alertTitle),
+          content: Text(err),
+          actions: <Widget>[
+            TextButton(
+              onPressed: () => Navigator.pop(context, 'OK'),
+              child: const Text('OK'),
+            ),
+          ],
+        ),
+      );
+  // *************buttons*************
+
+  // ***addSpace***
+  SizedBox addSpaceH(double h) {
+    return SizedBox(height: h);
+  }
+
+  SizedBox addSpaceW(double w) {
+    return SizedBox(width: w);
+  }
+  // ***addSpace***
+
+  // *************inputs*************
   Container createInputBox(String text, double wid, IconData? icon,
       TextEditingController? controller) {
     if (icon == null) {
@@ -203,32 +137,78 @@ class _DrawingPageState extends State<DrawingPage> {
         ));
   }
 
-  SizedBox addSpaceH(double h) {
-    return SizedBox(height: h);
+  SizedBox dropList1(double width) {
+    var button = DropdownButton(
+      hint: const Text(
+        'Select Dot',
+        style: TextStyle(color: Colors.white, fontSize: 13),
+      ),
+      //icon: const Icon(Icons.fiber_manual_record, color: Colors.white),
+      alignment: AlignmentDirectional.bottomEnd,
+      value: dropdownValue1,
+      isDense: true,
+      borderRadius: const BorderRadius.all(Radius.circular(20)),
+      dropdownColor: Colors.green.shade800,
+      style: const TextStyle(
+        color: Colors.white,
+        fontSize: 18,
+      ),
+      onChanged: (String? newValue) {
+        setState(() {
+          dropdownValue1 = newValue;
+        });
+      },
+      items: graphData.getDots().map((location) {
+        return DropdownMenuItem(
+          child: Text(location.getName()),
+          value: location.num.toString(),
+        );
+      }).toList(),
+    );
+
+    return SizedBox(
+      child: button,
+      width: width,
+    );
   }
 
-  SizedBox addSpaceW(double w) {
-    return SizedBox(width: w);
-  }
+  SizedBox dropList2(double width) {
+    var button = DropdownButton(
+      hint: const Text(
+        'Select Dot',
+        style: TextStyle(color: Colors.white, fontSize: 13),
+      ),
+      alignment: AlignmentDirectional.centerEnd,
+      value: dropdownValue2,
+      isDense: true,
+      borderRadius: const BorderRadius.all(Radius.circular(20)),
+      dropdownColor: Colors.green.shade800,
+      style: const TextStyle(
+        color: Colors.white,
+        fontSize: 18,
+      ),
+      onChanged: (String? newValue) {
+        setState(() {
+          dropdownValue2 = newValue;
+        });
+      },
+      items: graphData.getDots().map((location) {
+        return DropdownMenuItem(
+          child: Text(location.getName()),
+          value: location.num.toString(),
+        );
+      }).toList(),
+    );
 
-  void showPopUp(String alertTitle, String err) => showDialog<String>(
-        context: context,
-        builder: (BuildContext context) => AlertDialog(
-          title: Text(alertTitle),
-          content: Text(err),
-          actions: <Widget>[
-            TextButton(
-              onPressed: () => Navigator.pop(context, 'OK'),
-              child: const Text('OK'),
-            ),
-          ],
-        ),
-      );
+    return SizedBox(
+      child: button,
+      width: width,
+    );
+  }
+  // *************inputs*************
 
 //*********ButtonsFunctions*********
   void addDotPushed() {
-    //showPopUp("Test", "Test message");
-    //var inp = int.tryParse(_textNameController.text);
     setState(() {
       if (_textNameController.text == "") {
         showPopUp("Error", "No name in \"Dot name\" box");
@@ -238,26 +218,24 @@ class _DrawingPageState extends State<DrawingPage> {
           showPopUp("Error", res);
         }
       }
-      clearTextControllers();
+      clearInputData();
     });
   }
 
   void addPathPushed() {
     setState(() {
-      if (_textNumbController.text == "") {
-        showPopUp("Error", "No number in \"Dot number\" box");
-      } else if (_textDestController.text == "") {
-        showPopUp("Error", "No number in \"Destination number\" box");
+      if (dropdownValue1 == null) {
+        showPopUp("Error", "Select output dot");
+      } else if (dropdownValue2 == null) {
+        showPopUp("Error", "select input dot");
       } else if (_textLnthController.text == "" &&
           graphData.getUseLengthBool()) {
         showPopUp("Error", "No length in \"Input length\" box");
       } else {
-        int? from = int.tryParse(_textNumbController.text);
-        int? to = int.tryParse(_textDestController.text);
+        int? from = int.parse(dropdownValue1!);
+        int? to = int.parse(dropdownValue2!);
         int? len = int.tryParse(_textLnthController.text);
-        if (from == null ||
-            to == null ||
-            (len == null && graphData.getUseLengthBool())) {
+        if (len == null && graphData.getUseLengthBool()) {
           showPopUp("Error",
               "Can't parse input.\nInts only allowed in \"Dot number\", \"Destination number\" and \"Input length\"");
         } else {
@@ -268,7 +246,7 @@ class _DrawingPageState extends State<DrawingPage> {
           }
         }
       }
-      clearTextControllers();
+      clearInputData();
     });
   }
 
@@ -305,26 +283,18 @@ class _DrawingPageState extends State<DrawingPage> {
           }
         }
       }
-      clearTextControllers();
+      clearInputData();
     });
   }
 
   void delDotPushed() {
     setState(() {
-      if (_textNumbController.text == "") {
-        showPopUp("Error", "No number in \"Dot number\" box");
+      if (dropdownValue1 != null) {
+        graphData.delDot(int.parse(dropdownValue1!));
       } else {
-        int? dot = int.tryParse(_textNumbController.text);
-        if (dot == null) {
-          showPopUp("Error", "Can't parse input.\nInts only allowed");
-        } else {
-          String? res = graphData.delDot(dot);
-          if (res != null) {
-            showPopUp("Error", res);
-          }
-        }
+        showPopUp("Error", "Nothing in input");
       }
-      clearTextControllers();
+      clearInputData();
     });
   }
 
@@ -336,14 +306,12 @@ class _DrawingPageState extends State<DrawingPage> {
         if (!result.files.single.path!.endsWith(".txt")) {
           showPopUp("Error", "Can open only \".txt\" files");
         } else {
-          //print(result.files.single.path!);
           String? res =
               graphData.replaceDataFromFile(result.files.single.path!);
           if (res != null) showPopUp("Error", res);
         }
       } else {
         showPopUp("Error", "No file selected");
-        // User canceled the picker
       }
     });
   }
@@ -355,7 +323,6 @@ class _DrawingPageState extends State<DrawingPage> {
         allowedExtensions: ["txt"]);
     if (outputFile == null) {
       showPopUp("Error", "Save cancelled");
-      // User canceled the picker
     } else {
       if (!outputFile.endsWith(".txt")) {
         outputFile += ".txt";
@@ -366,51 +333,167 @@ class _DrawingPageState extends State<DrawingPage> {
 
   void bfsPushed() {
     setState(() {
-      dfsAccessTable = null;
       bfsPath = null;
-      if (_textNumbController.text == "") {
+      dfsAccessTable = null;
+      startDot = null;
+      endDot = null;
+      if (dropdownValue1 == null) {
         showPopUp("Error", "No number in \"Dot number\" box");
-      } else if (_textDestController.text == "") {
+      } else if (dropdownValue2 == null) {
         showPopUp("Error", "No number in \"Destination number\" box");
       } else {
-        int? from = int.tryParse(_textNumbController.text);
-        int? to = int.tryParse(_textDestController.text);
-        if (from == null || to == null) {
-          showPopUp("Error",
-              "Can't parse input.\nInts only allowed in \"Dot number\" and \"Destination number\"");
-        } else {
-          bfsPath = graphData.bfsPath(from, to);
-          if (bfsPath == null) {
-            showPopUp("Info", "There is no path");
-          }
-          print(bfsPath);
+        startDot = int.parse(dropdownValue1!);
+        endDot = int.parse(dropdownValue2!);
+
+        bfsPath = graphData.bfsPath(startDot!, endDot!);
+        if (bfsPath == null) {
+          showPopUp("Info", "There is no path");
         }
+        print(bfsPath);
       }
-      clearTextControllers();
     });
+    clearInputData();
   }
 
   void dfsPushed() {
     setState(() {
       bfsPath = null;
-      bfsPath = null;
-      if (_textNumbController.text == "") {
+      dfsAccessTable = null;
+      startDot = null;
+      endDot = null;
+      if (dropdownValue1 == null) {
         showPopUp("Error", "No number in \"Dot number\" box");
       } else {
-        int? from = int.tryParse(_textNumbController.text);
-        if (from == null) {
-          showPopUp("Error",
-              "Can't parse input.\nInts only allowed in \"Dot number\".");
-        } else {
-          dfsAccessTable = graphData.dfsIterative(from);
-          if (dfsAccessTable == null) {
-            showPopUp("Err", "report this error.");
-          }
-          print(dfsAccessTable);
+        startDot = int.parse(dropdownValue1!);
+        dfsAccessTable = graphData.dfsIterative(startDot!);
+        if (dfsAccessTable == null) {
+          showPopUp("Err", "report this error.");
         }
+        print(dfsAccessTable);
       }
-      clearTextControllers();
+      clearInputData();
     });
   }
   //*********ButtonsFunctions*********
+
+  // build
+  @override
+  Widget build(BuildContext context) {
+    screenSize = MediaQuery.of(context).size.width;
+    _textGrNmController.text = graphData.getName();
+    return MaterialApp(
+        home: Scaffold(
+      appBar: AppBar(
+          title: const Align(
+              alignment: Alignment.topLeft,
+              child: Text("Graph name:\n",
+                  style: TextStyle(
+                    fontSize: 18,
+                    color: Colors.white,
+                  ))),
+          toolbarHeight: 110,
+          flexibleSpace: Container(
+            color: Colors.green.shade900,
+            child: Column(children: <Widget>[
+              const SizedBox(height: 5),
+              Row(children: [
+                addSpaceW(screenSize / 8 + 19),
+                createButton("\nAdd dot\n", addDotPushed),
+                createInputBox("Dot name", screenSize / 4 - 25, Icons.label,
+                    _textNameController),
+                addSpaceW(8),
+                createButton("\nAdd path\n", addPathPushed),
+                createInputBox("Input length", screenSize / 4 - 25,
+                    Icons.arrow_right_alt_outlined, _textLnthController),
+              ]),
+              addSpaceH(3),
+              Row(children: [
+                addSpaceW(6),
+                createInputBox(
+                    "Name", screenSize / 8 - 25, null, _textGrNmController),
+                //addSpaceW(screenSize / 8 - 4),
+                createButton("\nDel dot \n", delDotPushed),
+                //createInputBox("Dot number", screenSize / 4 - 25, Icons.fiber_manual_record, _textNumbController),
+                addSpaceW(54),
+                dropList1(screenSize / 4 - 80),
+                addSpaceW(54),
+                createButton("\nDel path\n", delPathPushed),
+                addSpaceW(54),
+                dropList2(screenSize / 4 - 80),
+                //createInputBox("Destination number", screenSize / 4 - 25, Icons.fiber_manual_record, _textDestController),
+              ]),
+            ]),
+          ),
+          actions: [
+            IconButton(
+              onPressed: () {
+                setState(() {
+                  startDot = null;
+                  endDot = null;
+                  bfsPath = null;
+                  dfsAccessTable = null;
+                  graphData.flushData();
+                  clearInputData();
+                });
+              },
+              icon: const Icon(Icons.delete_sweep),
+              iconSize: 60,
+            ),
+          ]),
+      body: CustomPaint(
+        painter: CurvePainter(
+            graphData: graphData,
+            bfsPath: bfsPath,
+            dfsAccessTable: dfsAccessTable,
+            start: startDot,
+            end: endDot),
+        child: Align(
+          alignment: Alignment.topRight,
+          child: ButtonBar(
+            mainAxisSize: MainAxisSize.min,
+            children: <Widget>[
+              createButton("Bfs", bfsPushed),
+              createButton("Dfs", dfsPushed),
+              createButton("Clear dfs or bfs", () {
+                setState(() {
+                  bfsPath = null;
+                  dfsAccessTable = null;
+                  startDot = null;
+                  endDot = null;
+                  clearInputData();
+                });
+              }),
+              createButton(graphData.getUseLengthStr(), changeLength),
+              createButton(graphData.getDoubleSidedStr(), changeOriented),
+              createButton("Save to file", fileSaver),
+              createButton("Load from file", fileOpener),
+              createButton("Help", () {
+                String out =
+                    "   В поле \"Graph name\" можно сменить имя графу.\n";
+                out +=
+                    "   Для добавления точки необходимо ввести имя в \"Dot name\" и нажать на \"Add dot\".\n";
+                out +=
+                    "   Для удаления точки необходимо ввести номер в \"Dot number\" и нажать на \"Del dot\".\n";
+                out +=
+                    "   Для добавления пути необходимо ввести: номер выходной вершины в \"Dot number\", номер входной вершины в \"Destination number\" ";
+                out +=
+                    "и, если граф взвешенный, то ввести длину пути в \"Input length\". Затем нажать \"Add path\".\n";
+                out +=
+                    "   Для удаления пути необходимо ввести номер выходной вершины в \"Dot number\" и номер входной вершины в \"Destination number\". Затем нажать \"Del path\".\n\n";
+                out +=
+                    "   Кнопки \"Bfs\" и \"Dfs\" нумеруют точки в зависимости от послежовательности, в которой они будут пройдены.\n";
+                out +=
+                    "   Кнопки \"Взвешенный\" и \"Ориентированный\" позволяют сменить эти значения перед построением графа (т.е. для их работы граф должен быть пустым).\n";
+                out +=
+                    "   Кнопки \"Save to file\" и \"Load from file\" позволяют вывести информацию в файл и загрузить информацию из файла соответственно.\n";
+                out +=
+                    "   Кнопка \"Help\" описывает работу с интерфейсом программы.";
+                showPopUp("Help:", out);
+              })
+            ],
+          ),
+        ),
+      ),
+    ));
+  }
 }

flutter/lib/src/graph.dart

@@ -363,6 +363,7 @@ class Graphs {
   List<Dot> getDots() => _dots;
   String getName() => _name;
   String? getNameByNum(int n) => _nameTable[n];
+  Map<int, String> getNameTable() => _nameTable;
   int getDotAmount() => _dots.length;
   int? getNumByName(String n) {
     for (var i in _nameTable.keys) {
@@ -567,6 +568,7 @@ class Graphs {
   }*/
 
   List<int>? bfsPath(int startDot, int goalDot) {
+    if (startDot == goalDot) return [startDot];
     //if (!bfsHasPath(startDot, goalDot)) return null;
     startDot--;
     goalDot--;
@@ -606,7 +608,6 @@ class Graphs {
 
     //Восстановим кратчайший путь
     //Для восстановления пути пройдём его в обратном порядке, и развернём.
-
     List<int> path = <int>[];
 
     int cur = goalDot; //текущая вершина пути